I don't have an answer for you...
However, I did note that you are using PG. To that end, make sure to update the driver:
2 Guests always showing in Online User list
Is there a way to tell who the guests are and when they last connected? My forum is not 100% live, yet I can always see 2 Guest users in the online user list.. (also in the admin section). Either 2 people came online, didnt sign in and then left their browsers open for the last 5 days or there is something wrong.. I have restarted Nodebb a few time since i first so them appear.
@whitts may be this is related gh#4038
@pichalite thanks.. Looks like it's that.